Remove cabal.config from Haskell.
Remove cabal.config from Haskell.

The Stackage project provides a cabal.config which locks in a specific
package set.  This file should be shared between developers project so
that everyone is developing using the same versions of packages.

szymanskirafal/gitignore,szymanskirafal/gitignore,szymanskirafal/gitignore